Thanks blackcat
That's interesting about the jumping jacks - DS can do them but it always looks awkward.
A data point re jumping jacks: DS7 is on a Little League team. Most of the kids are 6-8 years old and neurotypical. FWIW - I took a hilarious video of them warming up on Saturday doing jumping jacks. There was one kid who had the standard form. Every other kid (including my DS) had his own interpretation. One kid (coach's son) was just jumping up and down and punching his hands forward. My DS had the hands doing the right thing and the feet doing the right thing - but not at the same time. Several kids cycled between jumping up and down and waving their hands over their heads. Several others just looked baffled, and two sat down. The coach, bless him, just praised any kid who was jumping and moving hands/feet in some fashion.
Then they moved on to push-ups which was it's own version of wacky.
My point being - I think it's not that unusual for a 6-8 year old not to be able to do jumping jacks.
